johnson



(No Model.)

B. H. JOHNSON.

ELECTRIC CONTROLLING AND OPERATING DEVICE. No. 435.898. Patented Sept. 2, 1890.

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Z ATTORNEYS.

WITNESSES- UNITED STATES PATEN OFFICE.

EDlVARD ll. JOHNSON, OF NEIV YORK, N. Y., ASSIGNOR TO THE INTERIOR CONDUIT AND INSULATION COMPANY, OF SAME PLACE.

ELECTRIC CONTROLLING AND OPERATING DEVICE.

SPECIFICATION forming part of Letters Patent No. 435,898, dated September 2, 1890.

Application filed October 19 1887. Serial No. 252,802. (No model.)

T0 (0% whom it may concern.-

Be it known that I, EDWARD H. JOHNSON, of the city oENew York, in thecountyand State of New York, have invented a certain neWand useful Improvement in Electrical Controlling and Operating Apparatus, of which the following is a specification.

The object I have in view is such an improvement upon the electrical controlling or operating apparatus described in an application for patent of even date herewith (Serial No. 252,801) that the same will be particularly adapted for control by a thermostat, a float, or a delicate indicator of electrical conditions, pressures, temperatures, and the like, which are liable to fluctuate at the limits of their movement and might set my apparatus in operation a second time and thus establish conditions opposite to those desired.

Hy present apparatus is designed to make the controlling device inert at each contact after it has once set the apparatus in operation from that contact, the operation from one contact setting the parts for operation from the opposite contact. ThisI accomplish by carrying the cireuitfrom each of the limit contacts or steps through a separate circuitbrcaker acted on by the spring-snapping movementand open ing the circuit at that contact when the movement works, which then closes the circuit at the opposite contact.

- shaft of an electric motor 0.

The circuit from each contaetalso has a separate circuit-maintaining magnet.

The invention consists in the several novel devices and combinations hereinafter described, and pointed out by the claims.

In the accompanying drawings, forming a part hereof, Figure 1 is a view,partly in diagram,illustrating the invention in connection with a thermostat; Fig. 2, amodified arrangement of the circuit-maintaining magnets, and Fig. 3 a view illustrating the use of a float as the controlling device.

A is the arm, which is thrown back and forth by the spring-snappin g movement B. (Shown in dotted lines in Fig. l.) The spindle of the snapping movement has a worm-wheel a, which is turned by a worm I), mounted on the The arm A may carry the moving electric contacts of a switch,

as described in the application before refer red to; or it may be connected with any object it is desired to move, such as a hot-air register or a steam, air, or water valve. As

shown, it is connected by a rod 0 with the crank-arm (Z of a damper D, which may open and close a flue for supplying hot or cold air to the room in which is located the controlling lJlIlBIlllOSiJILlI,Ol it may be a furnace-damper. At the limits of the movement of the arm A are two sets of contacts 6 f and g h, the contacts e f being bridged by the arm at one limit of its movement, and the contacts g h being bridged by the arm at the other limit of its movement.

E is a controlling-thermostat playing between limit steps or contacts 1' 7:.

F and G are two circuit-maintaining magnets having armatures Zm and front contacts a 0, and II is the source of electrical supply, which may be a galvanic battery or a suitable connection with the conductors of an electric light or power system or circuit. The circuit-connections are from one side of the source H by wire 1 to the armature and field of the electric motor 0. From the motor 0 the circuit is divided into two parts. One part passes by wire 2 to contact 6, from eontaetf by wire 3 to magnet G, and by wire 4 to the thermostat-contact it. The other part of the divided circuit passes by wire 5 to contact g, from contact h by wire 6 to magnet F, and by wire'l' to the thermostat-contact i. From the thermostat E a single wire 8 extends to the other side of the source II. The armature Z and front contact a of the magnet F are connected by wires 9 and 10 with the wires 7 and 8, while the armature m and front contact 0 of the magnet G are similarly connected by wires 11 and 12 to the wires 4 and 8, these connections forming, when closed. shunts around the thermostat-contacts. Vith the parts in the position shown the thermostat can produce no eltcct by touching the contact c. When, however, it touches the contact It, the circuit will be closed through the contacts of, the electric motor, and the maintaming-magnet G. The magnet G will attract its armature and close at 0 the shunt around the thermostat, thus relieving the IOO thermostat-contacts from the duty of carrying the current to the motor. The motor will start and will run until the snapping movement works, when the arm A will be thrown to the otherside, opening or closing the damper and leaving the contacts 6 f and passing over to the contacts 9 h, thus opening the division of the circuit through the magnet G to contact is. Now the thermostat can produce no further effect on contact 7t until it has first touched contact '6 and caused the parts to operate from that contact.

In Fig. 3 is shown a float 11, used as the controlling device in place of the thermostat. This is shown simply as an illustration of one of the many controlling devices that may be substituted for the thermostat.

In Fig. 2 the circuit-maintaining magnets F G are shown as acting directly upon the thermostat-bar. They serve to make a good closme of the circuit at the thermostat-contacts and to maintain it until the snapping movement acts and opens the circuit.

The snapping movement B is not fully illustrated and described herein, it being a mechanical movement made use of in a wellknown form of electrical switch. (Letters Patent No. 376,976, dated January 24, 1888.) I simply substitute the worm-wheel a for the handle of the switch.

1 What I claim is 1. In an electrically-operated controlling or operating device, the co mbination, with a circuit-controller closing different circuits at its limit stops or contacts, of a spring snapping movement, an electric motor operating the snappingmovement and in circuit with the cirouit-controller, and circuit-breakers Worked by the spring snapping movement and acting to alternately break and make the circuits leading to such controlling limit-stops, substantially as set forth.

2. In an electrically-operated controlling or operating device, the combination, with a circuit-controller closing different circuits at its limit stops or contacts, of a spring snapping movement, an electric motor operating the snapping movementand in circuit with the circuit-controller, circuit-breakers worked by the spring snapping movement and acting to alternatelybreak and make the circuits leading to such controlling limit-stops, and circuit-maintaining magnets in circuit with such controlling limit-stops, substantially set forth.

In an electrically-operated controlling or operating device, the combination, with a circuit-controller closing different circuits at its limit stops or contacts, of a moving apparatus set in motion by the circuit-controller, circuit-breakers worked by the moving apparatus and acting to alternately break and make the circuits leading to such controlling limitstops, and circuitmaintaining magnets in circuit with such controlling limit-stops and acting to shunt such controlling limit-stops, substantially as setforth.

This specification signed and witnessed this 5th day of October, 1887.

EDWD. II. JOHNSON. \Vitnesscs:

WILLIAM PELZER, E. O. ROWLAND. 

